I agree, I say I agree with you. The whole air pruning or copper lines pots prove , I say prove that.They grow vertically without roots touching the sides. That is incorrect. Post some scientific evidence of that please. Otherwise I call BS. I have 6 in flower in 22 gallon tubs that say otherwise. Additionally I sever roots with knives, weed pullers and trowels specifically to KEEP them from ever touching the sides.